Villager trading is broken

in this world, i cannot trade with villagers.  this problem is in the game since 1.14.3 pre-release 2

also, i cannot find a way to disable the discounting in villagers.  if this is a bug, fix it, if not, add a way.

back to the orriginal problem, the gui opens and then immediately closes

 

link to map:

http://www.mediafire.com/file/zwggcwqk8mahdxs/Minevolution+2.1.0.1.0.zip